Reliability considerations for water distribution networks are an integral part of all decisions regarding the planning, design and operation phases of such systems. Often connectivity and capacity indexes are used to measure the network's ability to supply the demand points with sufficient amounts of water, but these measures does not incorporate the hydraulic conditions in the network. This paper present an approach to calculate highly realistic reliability measures in reasonable time allowing simultaneous failure of equipment. The approach is based on (deterministic) hydrostatic simulations of the conditions in the network combined with standard reliability calculation techniques. Failures of equipment such as links, pumps and valves are simulated and the effects of these failures are examined by a hydrostatic model. Using this approach combined with failure data for equipment failures, it is possible to calculate several measures of the network reliability as well as the importance of network equipment. To reduce calculation times, modularization is introduced which involves modeling the water distribution network in two stages: As a global model (e.g. leakage zones) and as a local model (e.g. detailed leakage zones). The software tool AquaRel has been developed to carry out the calculations. A case study from Trondheim in Norway has been performed, and some results are presented in this paper.
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